If the guide rod mount was at fault, do you think my issue would be present any any given speed? I did notice some pitting in the rubber at the mount during visual inspection.
I didnt use threadlock on the caliper bolts but I know its necessary. Will check them with tools but they feel very secure.

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-“Never trust a mechanic who drives new cars. They're either charging too much money for their work, or they can't keep an old car running - maybe both.”